Lolo:

They are common on jets, required if the airplane moves with the turbine at idle.

BVM, Century Jet, Robart, most of the jet kitters and jet accessory suppliers have them.

Even Du-Bro has a single wheel brake kit, but theirs is not satisfactory for a large plane. It is/was cable operated. But I don't find it in the latest catalogue.

Most of the big ones are air operated, if you have pneumatic gear you're set. except paying for them.

Bill.